What kind of arrangement was the First Triumvirate, formally speaking?
An official magistracy created by the Senate
A private political alliance with no formal constitutional office✓Bonne réponse
A military dictatorship jointly held by three men
An elected office called "triumvir" voted on by the popular assembly
Explication
The First Triumvirate had no legal status; it was simply an informal pact among three powerful individuals to cooperate politically. This distinguishes it from the Second Triumvirate of 43 BCE, which the Senate did establish by law as an official three-man magistracy.